Blender is a 3D computer graphics software program for developing visual effects, 3D games, animated movies, and software.  It is an open source program.
In Blender to manipulate objects, when you push “space” tab it will open a menu bar, from there, you can select the object of whatever size you want as a sphere, cube, etc. You can do many activities like add, delete, move, scale and even rotating the objects, once you select an object.
•To merge two objects into one in Blender, you have to follow the following steps•Select both object in object mode•Now to join the object into one Press Ctrl+J•Enter edit mode and change it to face manipulation mode•Remove the surface or faces that will be joined with each other by pressing X•Switch back to Vertex Manipulation mode
Join the objects by selecting the corresponding vertices from each object and using F to create a new face After pressing F, the two object will merge as a single object   _{Your Comment}